A man is crossing a river flowing with velocity of 5 m/s. He reaches a point directly across at a distance of 60 m in 5 s. His velocity in still water should be

Question

A man is crossing a river flowing with velocity of 5 m/s. He reaches a point directly across at a distance of 60 m in 5 s. His velocity in still water should be (A) 12 m/s (B) 13 m/s (C) 5 m/s (D) 10 m/s

Tardigrade Admin · Accepted Answer

t=(d/√v2-u2) ⇒ 5 =(60/√v2-u2) ⇒ u=13 m/s

Q. A man is crossing a river flowing with velocity of $5 m / s$ . He reaches a point directly across at a distance of $60 m$ in $5 s$ . His velocity in still water should be

12 m/s

13 m/s

5 m/s

10 m/s

$t = \frac{d}{v ^{2} - u ^{2}}$

$\Rightarrow 5 = \frac{60}{v ^{2} - u ^{2}}$
$\Rightarrow u = 13 m / s$

Q. A man is crossing a river flowing with velocity of 5m/s. He reaches a point directly across at a distance of 60m in 5s. His velocity in still water should be